Microstrip parallel-coupled line wideband bandpass filter using e-shape resonator

In this paper, a compact wideband band-pass filter based on cross resonator and E-shape resonator is proposed. The equivalent circuit of the proposed band-pass filter is presented. By using odd-even mode analytical method, the design equations are derived and the resonant frequencies are deduced. A wideband band-pass filter can be designed based on the resonant conditions. By using E-shape resonator, the proposed wideband band-pass filter has two transmission zeros. For the verification, the wideband band-pass filter is fabricated, simulated and measured. The measured results are in good agreement with the simulated ones.